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dde_linux: fix packet size calc. of Nic drivers

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skb_push() already increases the skb->len by ETH_HLEN, hence adding
ETH_HLEN to the packet_size is redundant.

A too large packet size becomes a problem for large MTUs. With a maximum
MTU of 1500, adding ETH_HLEN twice will lead to a packet size of 1528.
Since this is larger than what we expect for good-old Ethernet (max. 1522),
some clients (e.g. the e1000 model in vbox5) may drop these packets.

Fixes genodelabs/genode#4228
This commit is contained in:
Johannes Schlatow
2021-07-20 18:36:26 +02:00
committed by Christian Helmuth
parent 119d72ad94
commit 1aba330ae6
4 changed files with 12 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
repos/dde_linux/src/drivers/nic/fec/lxc.c
View File

@@ -26,7 +26,7 @@ struct Skb skb_helper(struct sk_buff *skb)
skb_push(skb, ETH_HLEN);
helper.packet = skb->data;
helper.packet_size = ETH_HLEN;
helper.packet_size = skb->len;
helper.frag = 0;
helper.frag_size = 0;
@@ -43,9 +43,9 @@ struct Skb skb_helper(struct sk_buff *skb)
skb_frag_t *f = &skb_shinfo(skb)->frags[0];
helper.frag = skb_frag_address(f);
helper.frag_size = skb_frag_size(f);
/* fragment contains payload but header is still found in packet */
helper.packet_size = ETH_HLEN;
}
else
helper.packet_size += skb->len;
return helper;
}

6
repos/dde_linux/src/drivers/usb_modem/lxc.c
View File

@@ -30,7 +30,7 @@ struct Skb skb_helper(struct sk_buff *skb)
skb_push(skb, ETH_HLEN);
helper.packet = skb->data;
helper.packet_size = ETH_HLEN;
helper.packet_size = skb->len;
helper.frag = 0;
helper.frag_size = 0;
@@ -47,9 +47,9 @@ struct Skb skb_helper(struct sk_buff *skb)
skb_frag_t *f = &skb_shinfo(skb)->frags[0];
helper.frag = skb_frag_address(f);
helper.frag_size = skb_frag_size(f);
/* fragment contains payload but header is still found in packet */
helper.packet_size = ETH_HLEN;
}
else
helper.packet_size += skb->len;
return helper;
}

6
repos/dde_linux/src/drivers/usb_net/lxc.c
View File

@@ -26,7 +26,7 @@ struct Skb skb_helper(struct sk_buff *skb)
skb_push(skb, ETH_HLEN);
helper.packet = skb->data;
helper.packet_size = ETH_HLEN;
helper.packet_size = skb->len;
helper.frag = 0;
helper.frag_size = 0;
@@ -43,9 +43,9 @@ struct Skb skb_helper(struct sk_buff *skb)
skb_frag_t *f = &skb_shinfo(skb)->frags[0];
helper.frag = skb_frag_address(f);
helper.frag_size = skb_frag_size(f);
/* fragment contains payload but header is still found in packet */
helper.packet_size = ETH_HLEN;
}
else
helper.packet_size += skb->len;
return helper;
}

6
repos/dde_linux/src/lib/wifi/lxc_emul.c
View File

@@ -38,7 +38,7 @@ struct Skb skb_helper(struct sk_buff *skb)
skb_push(skb, ETH_HLEN);
helper.packet = skb->data;
helper.packet_size = ETH_HLEN;
helper.packet_size = skb->len;
helper.frag = 0;
helper.frag_size = 0;
@@ -55,9 +55,9 @@ struct Skb skb_helper(struct sk_buff *skb)
skb_frag_t *f = &skb_shinfo(skb)->frags[0];
helper.frag = skb_frag_address(f);
helper.frag_size = skb_frag_size(f);
/* fragment contains payload but header is still found in packet */
helper.packet_size = ETH_HLEN;
}
else
helper.packet_size += skb->len;
return helper;
}